YASKAWA P7 User Manual page 153

Digital
Operator Display
PI Feedback Loss
This fault occurs when PI Feedback Loss
FBL
Detection is programmed to fault
Feedback Loss
(b5-12 = 2) and the
PI Feedback < PI Feedback Loss Detection
Level (b5-13) for the PI Feedback Loss
Detection Time (b5-14)
Cooling Fin/Cooling Fin Fan Overheat
The temperature of the Drive cooling fin
OH
exceeded the temperature programmed in
Heatsnk Overtemp
parameter L8-02
(Flashing)
Drive Internal Cooling Fan
OH2
Drive overheat pre-alarm signal is input
Over Heat 2
from a multi-function digital input terminal
(Flashing)
OH3
Motor Overheating Alarm
Motor Overheat 1
The Drive stops or continues operation
(Flashing) according to the setting of L1-03.
OV
DC Bus Overvoltage
208-240Vac: Trip point is ≥ 400Vdc
DC Bus Overvolt
480Vac: Trip point is ≥ 800Vdc
(Flashing)
Table 6.2 Alarm Displays and Processing
Description
Diagnostic & Troubleshooting 6 - 9
Cause
PI Feedback source
(e.g. transducer, sensor, build-
ing automation signal) is not
installed correctly or is not
working
Cooling fan(s) are not working,
high ambient temperature, a
heating unit in close proximity
to Drive is present
An external overheat condition
exists connected to one of the
multi-function input terminals
S3, S4, S5, S6 or S7
Overheating of motor
High input voltage at R/L1,
S/L2 and T/L3
The deceleration time is set too
short
Power factor correction
capacitors are being used on the
input to the Drive
Corrective Action
Verify Drive is programmed to
receive the PI Feedback source
signal
Check to ensure the PI Feedback
source is installed and working
properly
Check the motor for a phase-to-
phase short
Check the Drive for a phase-to-
phase short at the output
Verify C1-01 and C1-02 are set
correctly
Check load conditions
Check for dirt build-up on the
fans and cooling fins
Reduce the ambient temperature
around the Drive
Remove the heating unit
Check for an external condition
Verify the program parameters
H1-01 thru H1-05
Recheck the cycle time and the
size of the load
Recheck the accel/decel time
(C1-01 and C1-02)
Recheck the V/F pattern (E1-01
thru E1-13)
Recheck the motor rated current
value (E2-01)
Check the digital operator
connector
Verify the setting of
o2-06
Check the input circuit and
reduce the input power to within
specifications
Extend the time in C1-02
Remove the power factor correc-
tion capacitors